"He had been stabbed close to 20 times to his chest, his legs and his back. His throat had been cut and he'd been left to die on the floor of his house," she said.

Ms Telfer said the attack happened less than an hour after the pair left the Thevenard Hotel, where they appeared have got along well.

Ms Telfer said both had "high levels of alcohol in their system" and Coleman would claim he acted in self-defence.

"He told various people that he had killed Mr Martin because Mr Martin had taken a knife and threatened to kill him," she said.

"There is evidence that undermines the accused's claim that he did what was necessary to defend himself, genuinely believing that it was necessary to do so.

"Whilst Tony Martin sustained the attack that I have described to you in terms of his injuries, the accused on his arrest was examined by a medical practitioner and found to have not a mark on him."

She read to the jury what Coleman told police in an interview.

"My mate treat me like shit and he got the knife and he put the knife against my throat, so the only thing I can do is protect myself and he done the wrong thing by me, so I told him don't you ever do that to me again ... so only thing I can do is f***ing kill him, and cut his throat and keep on f***ing stabbing him in his own f***ing heart."

She said the prosecution believes Coleman was not telling the whole story of what happened at house of Mr Martin, 33.